I have some small rectangles.中文

1.the square is divided into five rectangles ,the perimeter of each reactangle is 30 cm,if you don't set x can you work out the perimeter of this square?
2.a small square 's side length is 4cm ,if we make 9 squares like this into a big square,what is the perimeter of this big square?
3.we puzzled a big rectangle with some small rectangles,the area of the big rectangle is 270cm²,can you work out the perimeter of big rectangle?
4.three squares with the side length 15cm were puzzled into a rectangle ,what is the perimeter of this rectangle?

thereisanelectrictoyformedbyarectangles（8.28cm×5.14cm）andacircleofradius3cm（withababyfaceonit），theyconnectatponinta ande（asintheconstruction）．ifthecirclerollsfrompointaalongtherectangularinnerwall（noslip）．finallyreturnstotheoriginalposition． Ⅰ．pleasesketchthecirclewithababyfaceatpositionb，c，drespectively． Ⅱ．thecirclerolls______***s． 有一个电动玩具，它有一个8.28×5.14的长方形盘（单位：厘米）和一个半径为1厘米的小圆盘（盘中画有娃娃脸）它们的连接点为a、e（如图）．如果小圆盘沿着长方形内壁，从a点出发，不停的滚动（无滑动），最后回到原来的位置． （1）请你分别画出小圆盘（娃娃脸）在b、c、d位置示意图． （2）小圆盘共自转了______圈．